Title :
Modeling and analysis of DC-link voltage for three-phase four-wire two-stage micro-inverter
Author :
Chen, Fan ; Qian Zhang ; Amirahmadi, Ahmadreza ; Batarseh, Issa
Author_Institution :
Dept. of Electr. Eng., Univ. of Central Florida, Orlando, FL, USA
Abstract :
DC-link voltage control plays a key role for two-stage micro-inverter application. Modeling &analysis of dc-link voltage is investigated in this paper. The first-stage circuit employs transient maximum power point tracking method to realize fast MPP tracking without causing output distortion and dc-link variation. In order to keep dc-link voltage constant, injecting current to grid varies with the output of a positive feedback of dc-link voltage regulator at steady situation. Two disturbances to cause dc-link constant are investigated and small signal model of dc-link voltage is also built while considering dynamic response. Followed by the small signal model of dc-link voltage, the dc-link capacitance is also calculated. The performance of dc-link voltage control is verified by experimental results based on a 400 watt two-stage three-phase four-wire prototype with grid-connected, the input voltage from 35V to 60V, dc-link voltage 400Vdc and AC output voltage 110V RMS.
Keywords :
dynamic response; invertors; maximum power point trackers; voltage control; voltage regulators; DC-link capacitance; DC-link voltage analysis; DC-link voltage control; DC-link voltage modeling; DC-link voltage regulator; dynamic response; fast MPP tracking; power 400 W; three-phase four-wire microinverter; transient maximum power point tracking method; two-stage microinverter; voltage 110 V; voltage 35 V to 60 V; Capacitance; Capacitors; Generators; Inverters; Mathematical model; Microwave integrated circuits; Voltage control;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2014 Twenty-Ninth Annual IEEE
Conference_Location :
Fort Worth, TX
DOI :
10.1109/APEC.2014.6803731
